Please notice what Bill said, cracknut. When you program back to stock, it will set a P1000 (drive cycle) code that will cause you to fail, if the code is still set. He said a couple of "key cycles" should clear that code out, but I would not take it to the smog test unless I had driven the truck for about a week to make sure.
We advise people with the gas tunes to just leave the tune in and remove the Gryphon and cable, so the smog folks don't see it. Nobody's ever failed by doing it this way.
- Jack
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